The Kenyan government has assured motorists that a free alternative route will be available for those unwilling to pay the Sh8 per kilometre toll on the upcoming Rironi–Mau Summit Expressway.
The Kenya National Highways Authority (KeNHA) on Thursday confirmed that the China Road and Bridge Corporation (CRBC), in partnership with the National Social Security Fund (NSSF), has been selected as the preferred bidder to construct and operate the 175-kilometre Nairobi–Nakuru–Mau Summit (A8) expressway.
The project, valued at Sh180 billion, will operate under a 30-year concession, allowing the consortium to bear the traffic and revenue risks. Construction is expected to start in 2026, with completion targeted for 2028.
Free Route for Motorists
KeNHA stated that the existing A8 road will remain open and toll-free, providing motorists with an alternative to the premium expressway. This move aims to ensure travel freedom and ease public concern over the introduction of toll fees.
“The preservation of existing road networks as toll-free alternatives ensures that motorists retain choice in their travel options between Nairobi and Western Kenya,” KeNHA said in a statement.
Additionally, the Nairobi–Maai Mahiu–Naivasha (A8 South) route will undergo major upgrades, including sections expanded into a dual carriageway, while remaining toll-free. This will serve as another option for budget-conscious travellers.
The Nairobi Expressway already operates a similar model, offering free parallel roads for motorists unwilling to use the premium lanes.
Toll Charges and Safety Features
Under the proposed model, motorists will pay Sh8 per kilometre for passenger and 4WD vehicles. The toll rate will rise by 1% annually, significantly lower than a competing bid that proposed Sh10 per kilometre with a 3% yearly increase.
The new expressway will feature an open tolling system with eight toll stations, including two in the Maai Mahiu stretch.
KeNHA has also emphasized improved traffic safety features, such as upgraded drainage, lighting, and anti-fog systems for high-risk zones, especially around steep gradients and fog-prone areas.
Major Benefits of the Project
The expressway is designed to reduce travel time between Nairobi and Mau Summit by hours, especially during peak periods, by expanding the current highway into a dual four-to-six-lane carriageway.
One of its key highlights will be a 4.5km viaduct through Nakuru town, aimed at eliminating urban congestion.
Economists say the project represents a balanced approach, allowing wealthier motorists and commercial operators to pay for convenience while maintaining free routes for all citizens.
“This model gives motorists the freedom to choose — pay for speed or stick to the free routes,” said an infrastructure expert.
Public Participation and Environmental Safeguards
Before construction begins, the consortium must undertake detailed environmental impact assessments, provide comprehensive cost analyses, and show how the free alternative routes will integrate with the toll system.
The PPP Committee approved the project on October 9, 2025, marking a milestone in Kenya’s infrastructure modernization drive.
Public participation forums will also be held to gauge motorists’ willingness to pay and gather input on potential socio-economic impacts.
Local Employment and Sustainability
The expressway is expected to create thousands of jobs during construction and operation, with training programs to enhance local skills.
The project also aims to support small businesses through sustainable initiatives, improve road safety, and boost regional trade along one of East Africa’s busiest corridors.
Negotiations are ongoing regarding tax exemptions, electronic toll collection systems, and land compensation for affected areas.
